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Contract Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Service Contracts And Sales
Disaggregation of Revenue [Line Items]
Receivables from contracts with customers	$ 189.7		$ 187.6
Unearned revenue from contracts with customers	154.4		149.1
Contract with customer, liability, unearned revenue	18.9	$ 17.4
Deferred upfront commissions and other costs	68.6		$ 67.6
Global Lifestyle
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	441.6	349.7
Global Housing
Disaggregation of Revenue [Line Items]
Disaggregated fee revenues	$ 32.1	$ 30.7

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